Discovery 2000 Metal Detector
(630-3007)                 Operation                  Faxback Doc. # 37706

Now that your metal detector is assembled, it's time to learn how to use
it.  Please read this section thoroughly before you use your Discovery


Hold the detector in a comfortable position and turn it on by rotating the
combination POWER/SENSITIVITY clockwise about 3/4's of a turn.  The
detector sounds three beeps, LCD arrow momentarily appear and unit presets
to the ALL METAL mode of operation.  If not, check that the batteries are
properly connected and make sure they are not low.


Your Discovery 2000 has three modes of operation:  ALL METAL, DISC, and

1.  All Metal:  By pressing the ALL METAL touchpad or when first turning
    the unit on, the unit will then respond to all types of metal without
    any discrimination.  As in the DISC and NOTCH modes, the detector will
    also require motion to detect a target in the ALL METAL mode.
2.  Disc:  By pressing the DISC touchpad, the detector will automatically
    reject iron and can then be adjusted by the DISC/NOTCH control for
    increased discrimination.  By turning the DISC/NOTCH control clockwise
    the detector will eliminate most trash items such as foil and aluminum
    while still detecting silver and copper - depending on how high it is
    set.  Most gold and nickels will also be eliminated when tuning the
    DISC/NOTCH control clockwise for higher discrimination.  When the
    DISC/NOTCH control is placed fully counterclockwise (Low), the detector
    will pick up all nickels and gold rings along with pull tabs and
    copper/silver coins, but still reject iron.

3.  Auto Notch:  This mode will automatically reject iron and most pulltabs
    yet retain detection of nickels and most small gold rings.  The
    DISC/NOTCH control will increase the width of the NOTCH as it is turned
    towards HIGH, making possible the rejection of screw caps and zinc
    pennies, yet still detecting Nickels and many gold rings.

     NOTE:  Some gold rings will not be detected in this mode of operation.
            A percentage of pull-tabs will still be detected especially
            pull-tabs that are broken in half in the shape of a "beaver


The LCD displays are located at the center of the control housing.  The
displays show a probable identification of the object (on the target ID
readout), as well as the mode of operation being used (on the target mode

The LCD target display will give a visual readout of the probable type of
metal being targeted and what denomination of coins are detected.  The LCD
target display will usually lock on when a target is being detected and not
lock on when the unit "falses" or an object is borderline discriminated.

The target ID readout displays various coins and metal objects, and a range
from GOLD to SILVER.  When the detector senses a target, an arrow will
indicate the probable target being detected.

NOTE:  When the arrow points to coin, the detector could be sensing either
       a coin or another type of metal (such as jewelry, tokens, medals, or
       even junk metal).

GOLD/SILVER range:  Indicated on the top of the readout.  The gold spectrum
is to the left of the meter and the silver spectrum is to the right.  Other
types of metal fall under both spectrums such as iron, foil, and nickel
under the gold spectrum and copper pennies under the silver spectrum.

1 CENT ZINC:  Indicates that the target probably is a zinc penny.  Will
usually emit a medium tone when targeted.  Other targets, such as large
gold, will also fall into this category.

SCREW CAPS:  Indicates that the target probably is a Screw Cap or other
types of metal such as bottle caps.  Medium size gold will also fall into
this range, as well as large aluminum items.

PULL TAB:  Indicates that the target is probably a pull-tab.  Some small
gold will also read as pul-tab.

IRON/FOIL:  Indicates that the target is probably iron or foil.  Some
rusted oxidized iron will occasionally register in the silver range.

     NOTE:  All of the target indications are used as symbols and a visual
            reference of what is being targeted.  Many other types of metal
            can fall under any one of these indications.  There is always a
            trash to treasure ratio when detecting; the LCD allows a visual
            reference to minimize the trash only - it will not completely
            eliminate all trash items.

LOW BAT INDICATOR:  Will blink when turning the unit on to indicate that it
is working.  If the indicator comes on and stays on, the batteries need

TARGET MODE:  Each arrow will lock on and stay on whatever choice of mode
the user has selected.  Each mode of operation can be set by choosing one
of the three Touchpads on the control panel after the unit is turned on.


When the Discovery 2000 is in the DISC or NOTCH modes, its Audio Target
Identification (ATI) system automatically classifies metal objects into
three categories, to make it easier to identify the type of target being

The detector sounds three different tones to distinguish between categories
of detected items:  a low tone for small gold and nickel; a medium tone for
most old and new pull-tabs and some gold; and a high tone for copper,
silver, and brass.

IRON & STEEL:  In the DISC or NOTCH modes, most iron and steel objects
usually will not be detected.  On occasion, if the iron is highly oxidized,
a tone may be emitted.  For instance, some rusted bottle caps will emit a
high tone and indicate on the LCD readout in the SILVER range.  

GOLD & NICKEL:  All nickels and many gold items will emit a low tone. 
There is a percentage of gold rings, around 15%, that emit a medium tone,
but the LCD will still read under the gold spectrum.

OLD & NEW PULL TABS:  These will usually emit a medium tone or no tone at
all if in the Notch mode.  If a pull-tab is broken in half, the "Beaver
Tail" part will emit a low tone.  There are also pull-tabs that are bent
and folded or highly oxidized that may emit a low tone.

COPPER, SILVER & BRASS:  These metals usually will all emit a high tone in
the DISC or NOTCH modes.

     NOTE:  When operating in the ALL METAL mode, Three Tone Audio Target
            Identification shuts down and only one medium tone is emitted
            for all types of targets.


1.  While testing the unit for it capability to pick up coins and other
    objects, always test away from other metals - a good start is outside 
    on the ground.  You cannot test a unit indoors on the floor, because 
    there is usually other metal in the floor that may conflict with the 
    detector's signal or even mask the signal completely.

2.  If you're not picking up coins or metal, even though your coil is close
    to the objects to be detected, there is a chance that you are not
    maneuvering the coil properly.  Do not move the coil too quickly and
    try not to sweep the coil less than an inch away from the object.

3.  No matter what mode of operation you've chosen (ALL METAL, DISC, or
    NOTCH),  your coil needs to be in movement before the unit will
    recognize a target.  If you're air testing, you need to point the coil
    to the ceiling and make sure there is no metal near the coil
    whatsoever.  The object your testing with needs to be swung in a
    side-to-side motion before the detector will be able to recognize it.

4.  Not all gold rings will give you a low tone.  Some gold rings fall in
    the pull-tab range and may emit a medium tone similar to the pull tab. 
    Some pull-tabs, especially if they are broken in half, will give you a
    low tone similar to most gold rings and nickels.

5.  Zinc pennies will emit a medium tone instead of a high tone as do
    copper pennies, quarters, and dimes.

6.  Do not swing the coil, or the test object, too quickly or it may give
    you a false signal.  When repetitively passing the coil over the
    object, allow a few seconds to pass to give the detector a chance to
    recover from its last reading.


Once you become familiar with how your metal detector works, you can fine
tune it to make it less sensitive to interference and more selective in
what it finds.  For example, you can make it tune out undesirable objects
and tune in precious metals, such as having it eliminate most pull-tabs
while detecting silver/copper coins.


Use SENSITIVITY to adjust the detector's sensitivity to conditions that can
cause it to respond erratically.  For example, broadcasting antennas and
power lines can cause false signals.

Be careful to not operate the SENSITIVITY so high that the Target Readout
becomes so erratic and false tones start emitting.  Rotate SENSITIVITY
clockwise to increase, or counterclockwise to decrease the detector's
sensitivity.  To determine how high to adjust the SENSITIVITY, turn the
SENSITIVITY clockwise while listening for false signals; if the unit starts
to chatter, emitting false signals, reduce the SENSITIVITY slightly until
the chatter stops.  For maximum depth of detection, always set SENSITIVITY
as high as possible.


Only applies when unit is not operating in the ALL METAL mode.  The
DISC/NOTCH control adjusts for different levels of discrimination.  When
operating in the DISC mode, the level of discrimination is increased by
turning the control clockwise from the LOW position.  NOTE:  Gold items
will also be eliminated as the control is turned clockwise.  When operating
in the AUTO NOTCH mode, the DISC/NOTCH control turned clockwise from LOW
will eliminate items that fall in the range of screw caps and zinc pennies,
in addition to most pull-tabs, yet retain nickels and most small gold


When first turning the unit on, the detector presets to the ALL METAL mode.
The DISC/NOTCH control will not affect operation in this mode.  By pressing
the ALL METAL touchpad, the unit will return to ALL METAL from any other
mode.  The detector will still require motion to detect a target in this
mode of operation.


To change operation mode to DISC, simply press the touchpad labeled DISC. 
The mode indicator (arrow) should now have an arrow pointing down to the
DISC position.  The DISC/NOTCH control knob now functions as a standard
variable discriminator.  As you rotate the DISC/NOTCH clockwise from the
LOW position, it rejects iron, foil, nickels (many gold items), pull-tabs,
and screw caps (in that order).


The purpose of the AUTO NOTCH is to provide automatic discrimination of
most trash items without the loss of nickels and most small gold objects.

By pressing the AUTO NOTCH touchpad, the mode indicator (arrow) will point
down to the AUTO NOTCH position.  In this mode, the detector emits a low
tone (for most small gold and nickels) and a high tone for copper, silver,
and brass.

The DISC/NOTCH control now expands the discrimination level; for instance,
zinc pennies and screw caps can also be eliminated by turning the control
clockwise - yet, nickels and small gold will be retained.

Expect some targets to be junk items, even if the detector emits a tone. 
Besides nickels, other items that might emit a low tone include foil, some
pull-tabs, and small gold rings.  Besides copper and silver, other items
that might emit a high tone include brass and other metals.



Accurate pinpointing takes practice and is best accomplished by "X-ing" the
suspected target area.

1.  Once a buried target is indicated by a good tone response continue
    sweeping the coil over the target in a narrowing side-to-side pattern.

2.  Take visual note of the place on the ground where the "beep" happens as
    the coil is slowly moved side-to-side.

3.  Stop the coil directly over this spot on the ground.

4.  Now move the coil straight forward and straight back towards you a
    couple of times.

5.  Again make visual note of the spot on the ground at which the "beep"

6.  If needed "X" the target at different angles to "zero in" on the exact
    spot on the ground at which the "beep" happens.


When swinging the coil, be careful to keep it level with the ground about
one to two inches from the surface.  Never swing the coil as if it was a

After selecting your choice of mode for operation, swing the searchcoil
gently side-to-side, slightly overlapping each sweep as you move forward. 
Make sure you keep your searchcoil approximately 1" above ground as you
search.  Raising it in the sweep or at the ends of your sweep will cause
false readings.  Move slowly, hurrying will only cause you to miss targets.

Most good objects will respond with a good repeatable signal.  If a signal
does not repeat after swinging the coil directly over the suspected target
a few times, it is more than likely trash metal.  When in the DISC mode,
iron and steel objects generally do not respond.  False signals can be
caused by trashy ground, electrical interference, or by large irregular
trash objects.  These signals are easily recognized by their often broken
or nonrepeatable nature.

The Discovery 2000 is a very sensitive and deep-seeking detector.  It will
loudly respond to many targets that other detectors would only emit a weak
signal for.  Because of this, trash-induced signals and other sources of
interference may emit signals that seem confusing.  The main key to
handling these types of false signaling is to dig only those targets that
emit a strong repeatable signal.  As you sweep the searchcoil back and
forth over the ground, learn to recognize the difference between the
signals that occur at random and signals that are stable and repeatable.

When searching very trashy ground, it is best to scan small areas with
slow, short overlapping sweeps.  To prevent erratic signals and difficult
pinpointing in trashy areas, consider purchasing the Discovery 4-Inch Coil
System (RadioShack Cat. No. 63-3009).


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